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    <title>Document</title>
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<body>
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        <!-- 左侧导航区域（可配合layui已有的垂直导航） -->
        <ul class="layui-nav layui-nav-tree" lay-filter="test">
          <li class="layui-nav-item"><a href="/">首页</a></li>
          <li class="layui-nav-item layui-nav-itemed">
            <a class="" href="javascript:;">分类管理</a>
            <dl class="layui-nav-child">
              <dd><a href="/category">分类列表</a></dd>
              <dd><a href="/article">文章列表</a></dd>
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          <li class="layui-nav-item"><a href="">系统设置</a></li>

          <li class="layui-nav-item"><a href="">the links</a></li>
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